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### Question: What are the symptoms of Postural orthostatic tachycardia syndrome?
### Response: Symptoms of Postural orthostatic tachycardia syndrome can include:
Increase in heart rate from supine to upright position of more than 30bpm or to a heart rate of 120 bpm within 10 minutes of standing Decrease in blood pressure which can lead to: Lightheadedness Syncope (fainting) Exercise intolerance Fatigue Poor blood flow to the organs and upper parts of the body which can lead to: Cold hands Chest pain Muscle weakness Shortness of breath Headache Vision problems Brain fog Depression Anomia (word finding problems) Difficulty concentrating Difficulty sleeping Gastrointestinal symptoms Stomach pain Constipation Diarrhea Bloating Nausea Vomiting Inappropriate levels of hormones Chills Fear Sweating Feeling nervous